Form values should return a Vec of values

[serzhiio]

Here i suggested more classic browser behavior #1834 , which was implemented in #1836.
Why was it changed again?

Let's assume we have group of fields with same name, in browser they are aggregated under same name in Array, like this:
field_name = ["value1","value2","value 3"]
even if one of values is empty it will persist in the array as empty value.
field_name = ["","","value 3"]

Current behavior is pushing all values into String with comma as separator:
field_name = "value1,value2,value3"

If one of values is empty it is simply excluded, but this is very tricky bc looks like there are no other fields:
field_name = "value1" - here looks like we have no more fields

And even this is possible:
field_name = ",value2,value3" - here first value is excluded, but the value exists but epmty

[serzhiio]

Everything i, personally, want is to have ability to understand how many fields with same name has been sent (even with empty values). Such values should not be united under one string.
This is also related to checkbox values, bc now if it is not checked(off) value not sent.

I believe that the right way is to send all values.

[serzhiio]

I am sorry guys, too much work for Saturday!
The only API change is that everything is inside String delimited with comma, it is not a enum anymore.
I can handle it.

[jkelleyrtp]

I was fixing forms in #1974 and one of the bugs was handling serialization with the array values. I'd like to keep a single type that we serialize across the border instead of being polymorphic over strings/arrays since they're quite similar.

Either we send only arrays or we send only strings. I chose comma-delimited strings - we might be missing an accessor that splits the string for you. The alternative is send only arrays and an accessor that gets the first value of that array. Either works.

The native browser type is an array I believe, so I think your implementation is closer to the browser.

Having an API as common as forms requiring an enum import and matching makes the user-facing API clunky, hence why it's just a string now. Plus, it's always better to have fewer types.

I recommend maybe pinning to a commit or 0.5.0-alpha.0 since we are merging breaking stuff that might not make it into the final release, given feedback (like this issue!).

[ealmloff]

I was fixing forms in #1974 and one of the bugs was handling serialization with the array values. I'd like to keep a single type that we serialize across the border instead of being polymorphic over strings/arrays since they're quite similar.

Either we send only arrays or we send only strings. I chose comma-delimited strings - we might be missing an accessor that splits the string for you. The alternative is send only arrays and an accessor that gets the first value of that array. Either works.

The native browser type is an array I believe, so I think your implementation is closer to the browser.

Having an API as common as forms requiring an enum import and matching makes the user-facing API clunky, hence why it's just a string now. Plus, it's always better to have fewer types.

I recommend maybe pinning to a commit or 0.5.0-alpha.0 since we are merging breaking stuff that might not make it into the final release, given feedback (like this issue!).

Merging the form values into a string loses information which makes it impossible to parse some forms like this:

select {
    multiple: true,
    oninput: move |ev| {
        println!("Input event: {:#?}", ev);
        println!("Values: {:#?}", ev.value().split(',').collect::<Vec<_>>());
    },
    // There is no way to know if the user has selected 1 and Item or Item,1
    option { value: "Item,1",  "1" }
    option { value: "1",  "2" }
    option { value: "Item",  "3" }
}